We get a bunch of customers every year who test their "new" crosses at various F stages as they develop them. These are both large farms, seed companies, and home growers. Some are looking to see if the current crop is similar to the last or any other thing they may want to know. The grower may use the heat values as a tool to select certain fields (or plants) for seeds or to not use them at all. It's just another tool if you want to use it. Of course, it does cost $50 per test and for the small home grower it is a lot to spend regularly.
Small businesses like ajdrew's and others may benefit in knowing what is happening objectively with the HPLC SHU testing. Many, even people on this forum, do it regularly.
If you do it, I suggest picking a dozen pods (or more) from different parts of the plants as well as different plants, if you have them. Then, dry that bunch and grind them up. Now that they are mixed well and you only need to send a couple of grams of powder of any super-hot type to the lab (milder peppers require 10 grams). I think we, Southwest Bio-labs, are the cheapest at $50 that I know of. Good luck!